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What (who) is umbilical cord - definition
![gestational age]] of 8 weeks and 3 days. The embryo is surrounded by the thin membranes of the [[amniotic sac]], the umbilical cord is seen in the center, attaching the embryo to the [[placenta]].](https://commons.wikimedia.org/wiki/Special:FilePath/8w3d with umbilical cord.gif?width=200 "gestational age]] of 8 weeks and 3 days. The embryo is surrounded by the thin membranes of the [[amniotic sac]], the umbilical cord is seen in the center, attaching the embryo to the [[placenta]].")
Wikipedia
In placental mammals, the umbilical cord (also called the navel string, birth cord or funiculus umbilicalis) is a conduit between the developing embryo or fetus and the placenta. During prenatal development, the umbilical cord is physiologically and genetically part of the fetus and (in humans) normally contains two arteries (the umbilical arteries) and one vein (the umbilical vein), buried within Wharton's jelly. The umbilical vein supplies the fetus with oxygenated, nutrient-rich blood from the placenta. Conversely, the fetal heart pumps low-oxygen, nutrient-depleted blood through the umbilical arteries back to the placenta.
